User Interface Design And Locational Imaging Implement Of Magnetic Resonance Spectrometer Based On NI Platform

Magnetic Resonance Imaging(MRI)technology is widely used in clinical medicine,archaeological research,food quality inspection and other fields,and the development of its core component spectrometer has also attracted increasing attention.At present,traditional spectrometer development often only focuses on the implement of hardware functions and ignores the application part of the software interface.The spectrometer only receives the sequence parameter file of the scanning console,analyzes and generates the specified waveform,and transmits the collected signal to the reconstruction computer,and they are not compatible with each other.The latest scanner and software version hinder the optimization and innovation of the pulse sequence.At the same time,for the spectrometer development and MRI pulse sequence design process,the function debugging often crosses each other,but the barriers for the development of the two fields are high,and the knowledge reserve of multidisciplinary integration is required,which has high requirements for users.The design user interface of this article is based on the National Instruments(NI)platform,using the Lab VIEW programming language,for MRI pulse sequence developers,spectrometer developers and scanning operators,to achieve sequence editing,simulation,waveform debugging and verification functions,and develope a multifunctional magnetic resonance spectrometer integrating visual pulse sequence editing interface,patient information management interface,scanning control interface,image reconstruction interface and system debugging interface.The visual pulse sequence editing interface not only realizes the design of two major types of sequence gradient echo and spin echo,but also draws and simulates the echo planar imaging fast sequence.At the same time,the editing environment can also design a hybrid sequence that meets specific clinical needs.The pulse waveform recovery verification is carried out through the scanning control and system debugging interface of the spectrometer,and the imaging verification can also be obtained in the image reconstruction interface.In addition,with the advantage of the platform,the pulse editing environment of this design generates independent applications.As long as the package format is based on the protocol and the Extensible Markup Language(XML)technology is used,it can be embedded in any other platform for pulse editing and scanning verification.According to actual clinical needs,the common Euler angle to direction cosine conversion and rotation matrix calculation in the field of automated intelligent instruments are used to realize the locational image function in scanning and meet the selection of any cross-section in the application.In order to verify the function of the system,this article collects the waveform generated by the pulse editing environment from the debugging interface and tests it with an oscilloscope.The analysis shows that the waveform generated by the visual sequence editing interface developed by our system is in line with the design expectations.In addition,in order to verify the stability of the system,the imaging results of different scanning parameters were tested,and the reproducibility of the quantitative results of the signal-to-noise ratio was counted,and the locational function of arbitrary cross-section selection was realized in the transverse,sagittal and coronal planes.